B.C.
Just lock the tv with a plug lock. You might be able to tell him the TV broke for awhile, but you'd probably be better to limit his watching time and not allow him to watch shows that you find objectionable. I just got the entire Gilligan's Island seasons 1 through 4 on DVD and let my son watch one a day. It's silly, he loves it, and it's completely harmless. You can control a whole lot if you keep him from watching live tv (and there are no commercials!).